Skip to main content
Equibles

MPWR

Monolithic Power Systems Inc

Company with tickers: MPWR

CIK
1280452
CUSIP
609839105
Shares Outstanding
49,130,000
13F Activity (30d)
530 filings 514 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,124
Total Value: $51,124,599,144
Total Shares: 46,759,592
Showing 1–100 of 1,154 holdings by value · page 1 of 12

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 1,124 13F filers · Δ vs Dec 31, 2025
Top Holder
13.0%
Jun 2023 → Mar 2026 · range 11.5% – 32.3%
+0.5 pts
Top 5
39.1%
Jun 2023 → Mar 2026 · range 30.5% – 57.2%
−1.9 pts
Top 10
51.5%
Jun 2023 → Mar 2026 · range 40.1% – 65.7%
−0.4 pts
HHI
411
Jun 2023 → Mar 2026 · range 296 – 1,247
Broadly held−48

Quarterly Activity

vs Dec 31, 2025
New
180
Increased
385
Decreased
411
Sold Out
121
Unchanged
148
Holder count: +59
Institutional value: +16.5%
Shares held: -3.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega FMR LLC +423,823 4,400,831
Mega ROYAL BANK OF CANADA +296,788 473,368
Large LORD, ABBETT & CO. LLC +111,472 121,847
Mega BlackRock, Inc. +110,076 6,072,467
Mega UBS Group AG +102,928 541,913

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega PRICE T ROWE ASSOCIATES INC /MD/ −428,440 1,262,954
Mega BANK OF AMERICA CORP /DE/ −167,413 382,162
Mega FIL Ltd −161,452 154,637
Mega WELLINGTON MANAGEMENT GROUP LLP −134,259 250,511
Large BROWN ADVISORY INC −120,858 379,897

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,083,449 $3,371,288,964
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 2,516,492 $2,751,406,528
Mega VANGUARD FIDUCIARY TRUST CO 278,499 $304,496,881
Mid Anther Capital Ltd 233,288 $255,065,434
Mega Vanguard Global Advisers, LLC 106,602 $116,553,296

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 6,034,394 $5,469,333,344
Mega NORGES BANK 726,705 $658,656,343
Mid Analog Century Management LP 70,723 $64,100,498
Large CIBC Private Wealth Group LLC 58,914 $53,397,293
Mid Pacer Advisors, Inc. 50,654 $45,910,759
Filter: New 180 Increased 385 Reduced 411 Sold out 121 Unchanged 148
Showing 100 of 1,154
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $6,639,331,785 12.99% 6,072,467
Mega FMR LLC $4,811,648,571 9.41% 4,400,831
Mega VANGUARD CAPITAL MANAGEMENT LLC $3,371,288,964 6.59% 3,083,449
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $2,751,406,528 5.38% 2,516,492
Mega STATE STREET CORP $2,392,746,180 4.68% 2,188,454
Mega Invesco Ltd. $1,623,726,424 3.18% 1,485,093
Mega GEODE CAPITAL MANAGEMENT, LLC $1,565,749,360 3.06% 1,432,066
Mega PRICE T ROWE ASSOCIATES INC /MD/ $1,380,850,755 2.70% 1,262,954
Mega FRANKLIN RESOURCES INC $1,015,362,434 1.99% 928,671
Mega T. Rowe Price Investment Management, Inc. $788,985,413 1.54% 721,622
Mega MORGAN STANLEY $717,638,853 1.40% 656,367
Mega FIRST TRUST ADVISORS LP $646,555,802 1.26% 591,353
Mega GOLDMAN SACHS GROUP INC $621,092,772 1.21% 568,064
Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ $620,770,232 1.21% 567,769
Mega BARCLAYS PLC $607,692,674 1.19% 555,808
Mega JPMORGAN CHASE & CO $606,720,681 1.19% 554,919
Mega UBS Group AG $590,860,551 1.16% 540,413
Mega VAN ECK ASSOCIATES CORP $573,539,702 1.12% 524,571
Mega NORTHERN TRUST CORP Bank $534,779,347 1.05% 489,120
Mega ROYAL BANK OF CANADA Bank $517,556,897 1.01% 473,368
Large VOYA INVESTMENT MANAGEMENT LLC $430,297,732 0.84% 393,559
Mega BANK OF AMERICA CORP /DE/ Bank $417,836,819 0.82% 382,162
Mega Legal & General Group Plc $415,570,307 0.81% 380,089
Large BROWN ADVISORY INC $415,360,384 0.81% 379,897
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $411,508,512 0.80% 376,374
Mega CITIGROUP INC $372,648,665 0.73% 340,832
Large Rafferty Asset Management, LLC $347,109,104 0.68% 317,473
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $330,415,833 0.65% 302,205
Mega Bank of New York Mellon Corp Bank $316,885,621 0.62% 289,830
Mega VANGUARD FIDUCIARY TRUST CO Bank $304,496,881 0.60% 278,499
Large KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC $291,563,643 0.57% 266,670
Mega WELLINGTON MANAGEMENT GROUP LLP $273,896,201 0.54% 250,511
Mid Anther Capital Ltd $255,065,434 0.50% 233,288
Mega BNP PARIBAS ARBITRAGE, SA $244,922,426 0.48% 224,011
Mega AMERICAN CENTURY COMPANIES INC $218,325,594 0.43% 199,685
Mega RAYMOND JAMES FINANCIAL INC $214,362,197 0.42% 196,060
Large DekaBank Deutsche Girozentrale Bank $208,220,854 0.41% 190,443
Large SG Americas Securities, LLC Broker-Dealer $198,733,856 0.39% 181,766
Mega DEUTSCHE BANK AG\ Bank $198,690,113 0.39% 181,726
Mega PRINCIPAL FINANCIAL GROUP INC $190,460,475 0.37% 174,199
Mega California Public Employees Retirement System Pension $174,562,074 0.34% 159,658
Mega Amundi $173,740,965 0.34% 158,907
Mega HSBC HOLDINGS PLC $173,703,792 0.34% 158,873
Mega Nuveen, LLC $170,402,970 0.33% 155,854
Large SEI INVESTMENTS CO $169,787,414 0.33% 155,291
Mega FIL Ltd $169,072,363 0.33% 154,637
Mega DIMENSIONAL FUND ADVISORS LP $168,121,147 0.33% 153,767
Large EARNEST PARTNERS LLC $165,938,822 0.32% 151,771
Large Artisan Partners Limited Partnership $164,956,994 0.32% 150,873
Mega NEUBERGER BERMAN GROUP LLC $164,119,487 0.32% 150,107
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $161,779,718 0.32% 147,967
Large NOMURA ASSET MANAGEMENT CO LTD $160,586,874 0.31% 146,876
Mega Swiss National Bank Bank $153,659,409 0.30% 140,540
Mid VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. $152,360,505 0.30% 139,352
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $151,975,650 0.30% 139,000
Mid TimesSquare Capital Management, LLC $151,800,714 0.30% 138,840
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $148,627,812 0.29% 135,938
Mega Mitsubishi UFJ Asset Management Co., Ltd. $143,865,179 0.28% 131,582
Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. $142,138,779 0.28% 130,003
Mega ENVESTNET ASSET MANAGEMENT INC $137,603,564 0.27% 125,855
Mega ALLIANCEBERNSTEIN L.P. $136,282,797 0.27% 124,647
Large LORD, ABBETT & CO. LLC $133,221,417 0.26% 121,847
Large Pictet Asset Management Holding SA $132,157,587 0.26% 120,874
Mega AMERIPRISE FINANCIAL INC $130,571,135 0.26% 119,423
Large Allspring Global Investments Holdings, LLC $129,896,538 0.25% 118,806
Mega Sumitomo Mitsui Trust Group, Inc. $125,149,214 0.24% 114,464
Mega VICTORY CAPITAL MANAGEMENT INC $122,446,453 0.24% 111,992
Mega Vanguard Global Advisers, LLC $116,553,296 0.23% 106,602
Mega RHUMBLINE ADVISERS $111,641,968 0.22% 102,110
Mega WELLS FARGO & COMPANY/MN $111,191,505 0.22% 101,698
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $106,929,630 0.21% 97,800
Large Allianz Asset Management GmbH $105,479,845 0.21% 96,474
Large Thrivent Financial for Lutherans $105,088,428 0.21% 96,116
Large NATIXIS ADVISORS, LLC $104,794,317 0.20% 95,847
Mid Robeco Schweiz AG $103,860,596 0.20% 94,993
Mid DF DENT & CO INC $96,815,049 0.19% 88,549
Large Impax Asset Management Group plc $96,713,367 0.19% 88,456
Large Caisse de depot et placement du Quebec $93,108,592 0.18% 85,159
Large CONGRESS ASSET MANAGEMENT CO $91,123,069 0.18% 83,343
Large Mirae Asset Global Investments Co., Ltd. $91,035,601 0.18% 83,263
Mid ZEVENBERGEN CAPITAL INVESTMENTS LLC $89,557,391 0.18% 81,911
Mega VANGUARD ASSET MANAGEMENT, Ltd $89,476,483 0.18% 81,837
Large ProShare Advisors LLC $89,043,517 0.17% 81,441
Mid FRONTIER CAPITAL MANAGEMENT CO LLC $87,138,901 0.17% 79,699
Large STIFEL FINANCIAL CORP $86,739,826 0.17% 79,334
Large Ensign Peak Advisors, Inc $85,386,261 0.17% 78,096
Large Baird Financial Group, Inc. $81,204,197 0.16% 74,271
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $80,527,414 0.16% 73,652
Large Quantinno Capital Management LP $79,564,172 0.16% 72,771
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $79,118,086 0.15% 72,363
Mega TD Asset Management Inc $78,841,468 0.15% 72,110
Mid Liontrust Investment Partners LLP $77,918,681 0.15% 71,266
Large STRS OHIO $76,323,483 0.15% 69,807
Large Candriam S.C.A. $75,379,922 0.15% 68,944
Large CIBC Bancorp USA Inc. Bank $75,243,253 0.15% 68,819
Mega LPL Financial LLC $74,286,572 0.15% 67,944
Mega National Pension Service Pension $74,036,195 0.14% 67,715
Large Zurcher Kantonalbank (Zurich Cantonalbank) Bank $70,895,000 0.14% 64,842
Large NATIONAL BANK OF CANADA /FI/ Bank $69,575,326 0.14% 63,635
Large BAMCO INC /NY/ $68,874,489 0.13% 62,994

Report a Problem

Category
Description
Email (optional, for follow-up)